Black men have a primal desire to genetically upgrade the white race.
Black men were subjected to survival of the fittest in Africa, and the weaker genes were pruned.
The white race had access to modern medicine, operations and processed foods long before the native races, so many inferior genes were able to survive.
It is very exciting for a black man to sow his seed into white women, especially if they ask for it to happen.
Hitler recognised the need to eliminate genetic defects from the human race, and was experimenting to find vaccines which would enable millions of men to be sterilised so that they could not breed. He believed that only a small percentage of men should do the breeding - just like modern artificial breeding of dairy cows to achieve genetic gain.
Hitler's defining moment was that other humans did not agree with him about who the breeding Bulls should be - and he committed suicide in the bunker as a coward afraid to face the music of what he had done to 6 million Jews and 20 million Russian soldiers.
Iran is experimenting with genes to eliminate defects in humans by peaceful means.